If you're still looking for writer I can cover the subject. Have recently done the research, though I didn't find many legit bitcoin casinos. Contact here or PM for more detail.
I offer iGaming content in English and Finnish, and do so with the price tag of 5 cents per word. I know the whole niche quite well, though for football and tennis tips you might consider hiring someone else. On the other hand reviewing betting sites or writing about eSports is right up my...